Anonymous
Anonymous asked in Science & MathematicsAstronomy & Space · 9 years ago

what's in between galaxies? is it called intergalactic space?

if not than what is intergalactic space?:]

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  • 9 years ago
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    Intergalactic space is the physical space between galaxies. The huge spaces between galaxy clusters are called the voids. Some theories put the average density of the Universe as the equivalent of one hydrogen atom per cubic meter. The density of the universe, however, is clearly not uniform; it ranges from relatively high density in galaxies (including very high density in structures within galaxies, such as planets, stars, and black holes) to conditions in vast voids that have much lower density than the universe's average.

    Surrounding and stretching between galaxies, there is a rarefied plasma that is thought to possess a cosmic filamentary structure and that is slightly denser than the average density in the universe. This material is called the intergalactic medium and is mostly ionized hydrogen; i.e. a plasma consisting of equal numbers of electrons and protons. The IGM is thought to exist at a density of 10 to 100 times the average density of the universe (10 to 100 hydrogen atoms per cubic meter). In rich galaxy clusters, it reaches densities as high as 1000 times the average density of the universe.

    The reason the IGM is thought to be mostly ionized gas is that its temperature is estimated to be quite high by terrestrial standards (though some parts of it are only "warm" by astrophysical standards). As gas falls into the intergalactic medium from the voids, it heats up to temperatures of 10^5 K to 10^7 K, which is high enough for the bound electrons to escape from the hydrogen nuclei upon collisions. At these temperatures, it is called the warm-hot intergalactic medium. Computer simulations indicate that on the order of half the atomic matter in the universe might exist in this warm-hot, rarefied state. When gas falls from the filamentary structures of the WHIM into the galaxy clusters at the intersections of the cosmic filaments, it can heat up even more, reaching temperatures of 10^8 K and above.

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  • 9 years ago

    Yes, the space between galaxies is called intergalactic space. At least that's what every sci-fi show I've watched has called it.

    It isn't completely empty, (well, technically no space is completely empty...) there are random stars and star clusters and clouds of gas scattered around, more of them the closer to a galaxy you are. It's like the area between two big cities - there are still houses and towns, just not a lot of them in one area.

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  • 9 years ago

    "Inter" is the latin prefix meaning "between".

    Therefore "intergalactic space" means "the space between galaxies".

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  • 9 years ago

    Google it

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